ShapeShift is an instant exchange for Litecoin, Bitcoin, Peercoin, Dogecoin, Darkcoin, and other cryptocoins.
It is the fastest way to trade between these digital currencies. An exchange between coins on ShapeShift takes only a few seconds, and no account is needed.
From start to finish you can change currencies in under ten seconds, no account required.
Let's assume you have Bitcoin and you want Litecoin. It goes like this:
No emails or passwords. No lengthy signup process. No accounts. No bid and ask orders. No friction.
ShapeShift's goal is to be the fastest, most private, and most convenient way to swap digital currencies, and the exchange rate will always remain competitive.
site link: http://www.shapeshift.io/
Choose carefully any service that store and manage funds for you. Very few Bitcoin businesses offer enough insurances to be used to store money securely like a bank at this point.